Vehicle cooling system

Abstract

A vehicle cooling system includes: an adsorption refrigerating machine having an adsorber that includes an evaporation-condensation section housing a first refrigerant, the adsorption refrigerating machine being configured to cool a third refrigerant that circulates between the evaporation-condensation section and a cooler core with evaporative latent heat of the first refrigerant; a second refrigerant flow passage through which flows a second refrigerant that circulates between the adsorption section and a radiator; a bypass flow passage that bypasses the radiator; a valve that is provided at a junction of the second refrigerant flow passage with the bypass flow passage on a downstream side of the radiator; and a valve controller configured to control the opening and closing of the valve based on the temperature of the second refrigerant.

What is claimed is: 
     
         1 . A vehicle cooling system comprising:
 an adsorption refrigerating machine including an adsorber having an evaporation-condensation section housing a first refrigerant, and an adsorption section housing an adsorbent that adsorbs the first refrigerant having evaporated from the evaporation-condensation section, the adsorption refrigerating machine being configured to cool a third refrigerant with evaporative latent heat of the first refrigerant, the third refrigerant circulating between the evaporation-condensation section and a cooler core;   a second refrigerant flow passage through which flows a second refrigerant, the second refrigerant flow passage circulating the second refrigerant between the adsorption section and a radiator;   a bypass flow passage that has a first end connected to the second refrigerant flow passage on an upstream side of the radiator and a second end connected to the second refrigerant flow passage on a downstream side of the radiator so as to bypass the radiator;   a valve that is provided in the bypass flow passage or an intermediate part of the second refrigerant flow passage, the intermediate part of the second refrigerant flow passage extending from a point at which the first end of the bypass flow passage is connected to the second refrigerant flow passage on the upstream side of the radiator to a point at which the second end of the bypass flow passage is connected to the second refrigerant flow passage on the downstream side of the radiator, the intermediate part passing through the radiator; and   a valve controller configured to control opening and closing of the valve based on a temperature of the second refrigerant.   
     
     
         2 . The cooling system according to  claim 1 , wherein
 the valve is provided at a portion of the second refrigerant flow passage at which the second end of the bypass flow passage is connected to the second refrigerant flow passage on the downstream side of the radiator.   
     
     
         3 . The cooling system according to  claim 2 , wherein
 the valve controller is configured to adjust an area of opening of the valve toward the intermediate part or toward the bypass flow passage based on the temperature of the second refrigerant.   
     
     
         4 . The cooling system according to  claim 1 , further comprising
 a temperature sensor that is provided in a part of the second refrigerant flow passage from a portion at which the second end of the bypass flow passage is connected to the second refrigerant flow passage on the downstream side of the radiator to the adsorption refrigerating machine, or in a part of the second refrigerant flow passage from the adsorption refrigerating machine to a portion at which the first end of the bypass flow passage is connected to the second refrigerant flow passage on the upstream side of the radiator, and that detects the temperature of the second refrigerant, wherein   the valve controller controls the opening and closing of the valve based on the temperature of the second refrigerant detected by the temperature sensor.   
     
     
         5 . The cooling system according to  claim 2 , further comprising
 a temperature sensor that detects the temperature of the second refrigerant, the temperature sensor being provided at the valve or on a downstream side of the valve in the second refrigerant flow passage, wherein   the valve controller controls the opening and closing of the valve based on the temperature of the second refrigerant detected by the temperature sensor.   
     
     
         6 . The cooling system according to  claim 1 , wherein
 the second refrigerant flow passage is connected to an auxiliary equipment on the upstream side of the radiator, and a temperature of the auxiliary equipment is adjusted with the second refrigerant.   
     
     
         7 . The cooling system according to  claim 2 , wherein
 a flow passage area of a part of the second refrigerant flow passage connected to the valve is larger than a flow passage area of the bypass flow passage.   
     
     
         8 . The cooling system according to  claim 1 , further comprising
 an engine cooling radiator that cools an engine, the engine cooling radiator being provided on a rear side from the radiator in a vehicle front-rear direction of a vehicle in which the cooling system is installed.